1999 Ford Ranger air won't blow out of vents, defrost, or floor

Multi-Diag Access J2534 has the function for air condition, such as Diagnosis of cooling electronic,
Reading settings cooling circuit,Test servo actuators
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Almost sounds like the actuators are inop. depending on which style you have, some are electrical motors and some are vacuum. These control the mode doors which move to deflect air to various vents.

your controls for floor,vent.defrost ect. is in default mode due to a loss of vacuum.
you need to inspect vacuum lines for being lose cracked,or disconnected.hose will run from engine
intake manifold through firewall into the dash.i'd start at intake manifold looking for bad hose

sounds like you have a blend air door problem or a a/c system problem, need to check both, you can check the blend air real easy, turn the key on, lay down on the passanger side floor and look up behind the dash, you should a white colored square box in your face, will have wires going to it, turn the temp control back and forth and see if the shaft on the blend air door motor is turning, you will notice any problems with it like sticking, binding, weired sounds coming from the motor, if that checks out good then you might want to check uot your a/c system, could be low on freon or have a component failure which will not turn the a/c on and blow cool air.

I had a problem with my 2000 ranger when I bought it. Air was coming out of defroster vents. Check for a vacuum hose that may be off under the hood. It uses vacuum to open the vents.

Check for a vacum leak from the engine to the a/c.The color of the hose is black. Also check if the heater control valve hose is unplugged. If you have vacuum the it sounds like the door for the vent/floor/defrost is broken.

Sounds like you have a supply vacuum problem. When you lose supply vacuum to the control head it defaults to defrost.

Have you checked to make sure your compressor is kicking in when turned to AC mode?

yes those controls are vacuum controlle. Could be as simple as a bad hose or connection.

it sounds like you had the same problem I had a while back. There is a couple of "doors" on the blower motor that sometimes get stuck or broken, I took my jeep into an offroad shop and they fixed it with spare parts. They assured me that even if you took it to the dealer it's only like a 15-30$ part but it's the shop time that will kill you.